Pb block to Pb powder? Is there any chemical way. The only way I can think of right now is the mechanical with a hammer, or melting it down and throw it on water.

Dont set your heart on this, I'll tell you straight out, its only a logical guess.

But could you salt the lead with an acid, then reduce it back to the metal with a base to steal the anion?

                                                  PrimoPyro

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Vivent Longtemps la Ruche! STRIKE For President!

A very fine file should do it. Lead is a very soft metal.